Pump



gfipi. 5 1933. A. L CARTER I 325,784?

' PUMP Filed Jan. 12, 1931 m 1% $9 129 184-30 mun 5 12 1 16, I 16 Patented Sept. 5, 1933 1 rU'MP I Alick L. Carter, Buffalo, N. Y., assignor to Grace P. Carter, Bui'falmN Y.

Application January 12,1931. Serial No. 508,165

6 Claims. (01. 103-126) This invention relates to a pump and more particularly to the geared type of pump although the invention can also be embodied in othertypes of pumps such as a centrifugal pump.

In the standard form of geared or centrifugal type of pump, particularly when driven by a belt or other means where a side thrust and end thrust is impartedto its driving shaft, considerable wear results in the impeller shaft and bearing and where the impeller is directly connected to the impeller shaft the impeller and the bore and side walls of the pump also wearrapidly. Also, particularly in a geared pump, when the impeller shait,through this side thrust, wears until it is out of alinement, besides having the side walls of the bore worn due to end thrust,

and where the impeller is mounted on the impeller shaft, the gears assume a position where they are out of alinement and since the efliciency of the pump is curate intermeshing of the gears, and small clearance space between the gears and bore and side walls, the pump rapidly drops inefficiency. Any misalinement of wear of the gears so that a replacement of the gears is necessary to restore it to its original efficiency. I

It is, therefore, the principal object of this invention to provide a pumpof the geared or cantrifugal type. in which the impeller is connected with the impeller shaft indirectly in such a manner that, the side and end thrust of the impeller shaft is not imparted to the impeller and therefore there is no wear of the impeller or impellers or their bores or the end walls of the working chamber through the side or end thrust of the impeller shaft.

A further aim is to accomplish this result in a pump which can be made substantially as com pact and having the sameefiiciency as the original eificiency of similar pumps of standard construction and in which the impeller shaft is of adequate strength and has adequate bearing in the pump casing so that the thrust on it does not result in excessive wear and leakage around the shaft. I

A .still further purpose is to provide such a pump which is,readily assembled and is readily accessible for repairs or replacements and in which in particular, all working parts or any one of them individually can be removed and replaced with a. minimum of disturbance to the other parts of the pump.

Another object is to provide play between the parts of the pump so that the end thrust of the entirely dependent on the ac-:

the gears is attended by direction of the arrows shown pump shaft in either direction is not transmitted to the pump gears, thereby reducing wear on the sides of these gears as well as the corresponding side walls of the bore.

A further purpose is to provide a pump in which the working parts of the pump can be supplied with an adequate amount of grease by only two grease cups thereby simplifying the method of keeping the pump condition.

Other objects are to provide such a pump whichis composed of, few parts and is not likely to get out of .order and in which no special machining operations are required other than those necessarily required in any thereby permitting the pump to be marketed at low cost and in direct competition with standard pumps of. its type. a

In the accompanying drawingthrough a geared type of pump embodying the present invention,-the section being taken on line I Figure l is a longitudinal, horizontal section which is used to a great extent as a force pump to deliver coolant to the cutting points of tools of various types oi production machinery. The numeral 5 represents a pump housing body section in which the driving impeller or gear 6 is arranged. T Meshing with the driving impeller or gear 6 is a driven impeller or gear 7.- These im- -pellers are arranged housing and are accurately fitted therein and acin' bores provided in the curately intermesh so that leakage past the same is reduced to a minimum. At one side of the intermeshing impellers an inlet 8 is provided in the housing and at the oppositeside an-outlet 9 is provided. One side of the housing section 5 is closed by a cover or head 10. It is therefore apparent that when,the gears are rotated in the in Figure 2 the liquid will be drawn through the inlet 8, pass between the teeth of the gears and be carried around between the teeth and the bores of the housing and since, as the gears accurately intermesh, the'liquid cannot escape back between the gears, it is forced out through'the outlet 9.

The driven impeller 7 is mounted on a spindle forming a hub 11 and it is therefore apparent that to operate at full efllciency, the driving imin good running pump of its type the drive shaft peller -6 must be held in fixed relation to it and to the bore of the housing. When the driving impeller 6 is mounted directly on the impeller shaft, the end thrust of. the impeller shaft gradually wears the sides of the gear and the side walls of the bore and the side thrust on the impeller shaft gradually wears the bearing and the consequent cocking of the impeller shaft is imparted to the driving impeller which necessarily causes wear of the driving impeller bore and also causes misalinement of the driving impeller with the driven impeller. These greatly reduce the efiiciency of the pump which is entirely dependent on accuracy of fit and also wears the parts so that they cannot be repaired but must be replaced.

To 'avoid this, the impeller shaft 12 in the present invention is mounted at one end in a bearing 13 which also serves as a gland, screws 14 being provided to compress the packing 15 around the shaft, and the other end 16 of the shaft is reduced, passes concentric and with sufficient clearance through a tubular spindle .17 on which the driving impeller 6 is rigidly mounted and is secured to a collar or dog 18, this collar or dog being fitted in the cover 10 so as to form a bearing for the inner end of the drive shaft'and to take up the end thrust of the shaft in either direction. The collar or dog 17 is preferably rigidly secured to the impeller shaft 12 by a dog point screw 19 or the like and is formed to provide 'atongue 20 which fits into a tenon 21 in the tubular spindle 17. The pump can be driven in any suitable manner as by a pulley 22 mounted on the outer end of the drive shaft 12.

It is apparent that when the pulley and shaft 12 is turned, the collar or also turned and through the tongue and tenon flexible connection 20 and 21 turns the hollow spindle 17 and the driving impeller 6 mounted on this spindle. This turns the two impeller gears and forces the liquid through -the pump. The drive shaft 12 has adequate bearing both by its collar 18 and by the gland 13, but as the side thrust of the pulley 22 causes these bearings It will also be noted that to wear, it is apparent-that only the shaft itself is afiected and no cooking of the driving impeller occurs since the tongue and tenon 20 and 21 forms "a flexible connection between these parts. The

impellers therefore stay accurately alined even after the pump has been subjected to severe "wear and'the rapid drop in emciency due to side and end thrust on the drive shaft and wear of bearings does not occur;

a substantial clearance 25 is left between the end of the driving gear spindle 17 and the enlarged part of the drive shaft 12 and a similar clearance 26 is left between the dog or driving collar 18 and the 'end of the driving gear spindle 17. By this means all the end thrust of the driving shaft 12 is.borne entirely by the driving collar or dog 18 and none of this end thrust is imparted to the driving gear 6. Ifthis end thrust were imparted to the driving gear 6, it would, of course, wear the sides of the gear and also the side walls of the bore or working chamber and quickly reduce the efliciency of the pump.

For ease intgetting at the working parts of 18 all that is necessary is dog 18 on the shaft is ranged in said housing,

. weaves loosen the dog point screw 19 and slip the collar and shaft out. To then get at the impellers 6 and 7 all that is necessary is to remove the cover 10. By this means the working parts of the pump are all readily accessible for repairs or replacements.

For convenience in greasing the pump two grease cups 27 and 28 are provided which supply grease to all of the working parts of the pump except for the lubrication supplied by the main stuifing box. The grease cup 27 is attached to the cap 23 and the grease from the grease cup passes around the dog or collar 18, lubricating its bearing, through the tubular spindle 17 of the driving gear 6, past the bearing for this spindle in the body part 5 of the gear housing and into the corresponding side of the bore 'or working chamber of the driving gear 6 thereby lubricating this gear 6. A part of the grease from the cup 27 also passes the bearing for the adjacent end of the spindle 17 and directly lubricates the gear 6 and the bore and end walls of its working chamber. The other grease cup 28 is arranged in the cover section 10 to discharge against the end of the spindle 11 of the driven gear 7. This spindle has a passage. 29 bored therethrough and conse quently a part of the grease passes around the I adjacent end of the spindle 11 thereby lubricating the bearing for the driven gear 7.and also the gear and its working chamber or bore while another part of this grease passes through the bore 29 and lubricates the far bearing and the far side of the gear 7 and its working chamber and bore. It is therefore apparent that the two grease cups 27 and 28 completely lubricate all parts of the pump which require lubrication.

From the foregoing present invention provides a pump which is compact, inexpensive, is composed of few parts which are not likely to, get out of order, is readily accessible'for repairs or adjustments and in which the side and end thrust of the pulley on the drive shaft will not be transmitted to the impeller or impellers so as to reduce their emciency arranged in said housing, an integral drive sh ft arranged in said housing and having a redu d end extending through said impeller, means for applying power to the enlarged end of said drive shaft, means for journalling the enlarged end it is apparent that the of said shaft, a collar arranged on the opposite side'of said impeller and fixed to the reduced end of said shaft,-means journalling said collar in.

said housing and means forming a flexible driving connection between said collar and impellei'.

3. A pump including a housing, an impeller ara tubular hub fitted in said impeller and journalled in said housing, an integral drive shaft arranged in said housing and having a reduced end extending through said hub, means for applying power to the enlarged end of said drive'shaft, means carried by said. housing for journalling the enlarged end of said shaft, a collar arranged on the opposite side of said impeller and fixed to the reduced end of said shalt, means journalling said collar in said nousing and means forming a flexible driving connection between said collar and impeller.

4. A pump including a housing having a body section and a cover section, an impeller arranged in said body section and enclosed by said cover section, .a hub on said impeller journalled in said cover section and body section, an integral drive shaft extending through said hub and joumalled in said body section, a collar fixed to said shaft and journalled in said cover section, and flexible joint means connecting said collar and said hub. 5. A pump including a housing having a body section and a cover section, an impeller arranged in said body section andenclosed by said cover section, an integral drive shaft extending through said impeller and journalled in said body section, a collar journalled in said cover section and removably secured to said shaft, said collar and shaft projecting outwardly from said cover section to permit of access toftheir securing secured to the means means forming a driving connection between said collar and impeller and a cap secured to said cover section and enclosing the end of said collar and shaft.

6. A pump including a housing having a body section and a cover section, an impeller arranged -in said body section and enclosed by said cover section, said impeller having a tubular hub journalled in said cover and body section, an integral drive shaft having a reduced endextending through said hub, means journalling the enlarged end of said shaft in said body section,

1 reduced end of said shaft and journalled in said cover section, said collar and shaft extending outwardly from said cover sec tion, means arranged exteriorly of said cover section for removably attaching said collar to said shaft, a cover secured to said cover section and fitted over the projecting end of said collar and shaft and a tongue and tenonconnection between said collar and said hub.

' ALICK L. CARTER.

a collar 

